The purpose of a pipe coating on underground steel or aluminum pipe is to isolate the metal from contact with the surrounding environment. This coating forms the first line of defense against corrosion. If the coating is installed free of holidays and if it does not deteriorate from soil stress, stray currents, chemical or other mechanical hazards, it would not require cathodic protection. Through present manufacturing techniques combined with proper handling and ridgid inspection, this "perfect" pipe coating is attainable. However, it is not always realistic or economically feasible to obtain this state of perfection and it is more practical to supplement the coating protection with the use of cathodic protection. Since a properly selected and applied coating will provide approximately 99% of the protection required, it is of utmost importance to know the advantages and disadvantages of all available coatings. "The right coating material properly used will make all other aspects of corrosion control relatively easy". 1 

Subject
Thermoplastic coatings, Costs, Primers, Coating performance, Coating inspection, Materials, Piping, Cathodic protection, Asphalt, Corrosion protection, Weight coatings, Mastic, Soil
© 1971 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1971
Association for Materials Protection and Performance (AMPP)
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